QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km S of Lake Roesiger, Washington

· 12 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 16 kmKing County 53 kmIsland County 59 kmSkagit County 60 kmKitsap County 65 kmChelan County 98 kmWhatcom County 98 kmPierce County 103 kmSan Juan County 106 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 1.8 (ml)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 16 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2803 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 47.9610, -121.9282. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 16 km (10 mi) SW of here earthquakes near Snohomish County
King County, WA 53 km (33 mi) N of here earthquakes near King County
Island County, WA 59 km (37 mi) ESE of here earthquakes near Island County
Skagit County, WA 60 km (37 mi) S of here earthquakes near Skagit County
Kitsap County, WA 65 km (40 mi) NE of here earthquakes near Kitsap County
Chelan County, WA 98 km (61 mi) W of here earthquakes near Chelan County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

55 earthquakes have been recorded within 50 km since this one.

  1. 1.6 6 km NE of Fall City, Washington
  2. 2.0 3 km E of Granite Falls, Washington
  3. 1.8 4 km N of Duvall, Washington
  4. 1.8 5 km NNE of Duvall, Washington
  5. 1.6 5 km WSW of Darrington, Washington
  6. 1.6 6 km NE of Fall City, Washington
  7. 1.6 3 km E of Cathcart, Washington
  8. 2.1 3 km ENE of Granite Falls, Washington
  9. 1.5 2 km SSW of Lynnwood, Washington
  10. 1.6 4 km ESE of Carnation, Washington
  11. 1.6 3 km ENE of Cathcart, Washington
  12. 1.7 2 km ENE of Granite Falls, Washington
  13. 2.8 8 km NNE of Snoqualmie, Washington
  14. 1.8 3 km E of Cathcart, Washington
  15. 1.6 4 km ENE of Cathcart, Washington

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.